/Engine/Plugins/Media/ElectraUtil/Source/ElectraBase/Public/Utilities/URLParser.h
Decodes XX escaped sequences into their original characters. Appends to the output. Hence in and out must not be the same.
static bool UrlDecode ( [FString](API\Runtime\Core\Containers\FString) & OutResult, const [FString](API\Runtime\Core\Containers\FString) & InUrlToDecode )